Sieve for middlings-purifiers



J. A. RANEY. Sieve for Middlings Purifiers.

(NoModeL) Patented Feb. 8,1881.

INVENTOR WITNESSES ATTORNEYS.

'LPETERS. PNUTO-UTuOGRAPHER. WASHINGTON. D. c.

U ITED STATES PATENT OFFICE.

JAMES A. RANEY, OF GROSS GUT, PENNSYLVANIA.

SIEVE FOR MIDDLINGS-PURIFIERS.

SPECIFICATION forming part of Letters Patent No. 237,597, dated February 8, 1881.

Application filed September 23, 1880. N0 model.)

To all whom it may concern:

Be it known that I, JAMES A..RANEY, of Gross Out, in the county of Lawrence and State of Pennsylvania, have invented a new and useful Improvement in Sieves for Middlings-Purifiers, of which the following is a specification.

Figure is a plan view of the improvement. Fig. 2 is a sectional end elevation taken through the line :20 00, Fig. 1.

Similar letters of reference indicate corresponding parts.

The object of this invention is to furnish sieves for middlings-purifiers so constructed that all parts of the sieve-cloths will be covered by the middlin gs, to prevent the air-blasts from passing through anyuncovered portion of the sieve, and thus prevent the consequent waste of fine middlings.

In the accompanying drawings, A represents the sieve-frame, which is tapered upon both sides, or gradually decreased in width from the upper to the lower end.

To the upper end of the frame A is attached the distributing-board B, which receives the middlings as they are introduced into the purifier, and from which they pass to the first sieve-cloth, G. The first sieve-cloth, O, is the finest and takes out the finest part of the middlings, or about half the volume. The coarser parts ofthemiddlings,thatcannotpass through the cloth 0, pass to the next cloth, D, and the next finest grade of the middlings is taken out, the coarser parts passing on to the next cloth, E, where they are again separated, and so on through the other cloths, F G, the coarse ofial falling from the lower end of the sieve. With this construction each sieve or section or number of cloth takes out about one-half the volume or quantity of the Iniddlin gs that pass upon it, and each succeeding section or number of cloth is made about half the size of the preceding section, so thatthe entire surface of the sieve-cloths will always be covered with middlings, to prevent the air-blast from passing through and carrying good middlin gs with it into the dust-room, thus causing a loss of fine middlings. The sieve-cloths G D E F G are secured along the central line of the sieve to a rib, H, the upper edge of which is a little lower than the upper edge of the sieve-frame A, to prevent the middlings from working toward the sides of the sieve.

The sieve is provided with covering-plates I, to cover the outer parts of the sieve-cloths, as indicated by dotted lines in Fig. 1, and shown in full lines in Fig. 2, which plates are adjustable, so that they can be arranged to regulate the proportional amount of exposed surface of the several numbers of sieve-cloths,

as the quality and quantity of the middlings to be separated may require. The covers I may be secured in place by pins,bolts, catches, or other suitable fastenings.

' Having thus described my invention, I claim as new and desire to secure by Letters Patcut-- 1. In a sieve for middlings-purifiers, the combination, with the tapered frame A and the tapered sieve-cloths O D E F Gr, of the central rib, H, having its upper edge a little lower than the upper edge of the frame A, substantially as herein shown and described, whereby the iniddlings are kept from gathering at the sides of the sieve, as set forth.

2. In a sieve for middlings-purifiers, the combination, with the tapered frame A, and with the tapered sieve-cloths (J D E F G, of the adjustable covers I, substantially as herein shown and described, whereby the amount of exposed surface of the sieve-cloths can be regulated, as set forth.

JAMES ALEXANDER RANEY.

Witnesses:

S. G. BLANCHARD, ABRAHAM RHonEs. 

